My first question comes from the first verse. "Why would anyone be 'worried' about the law of restoration?" Well... Let's take it from the potential perspective of someone in Corianton's situation. I guess if I had sinned with a harlot while I was on my mission, I might be a bit worried that the whole "what ye sow, that shall ye also reap" might come and bite me... Not sure... Just a thought.
In verse 4, it's interesting to note that after Alma states that things should be restored to their "proper order" and "natural frame", he states two examples, which in my mind don't seem too "natural" - however, I sense some deeper doctrine in this passage. The two examples he states are "mortality" to "immortality" and "corruption" to "incorruption". Well, upon a bit of further thinking, I guess they would have to be "in order" because every being on this planet will end up in an "incorrupt" and "immortal" state - due to the resurrection of Christ.
Those who debate the justice of God due to consequences brought unto them will always seem foolish. God looks on your heart, and gives you what you want - what you truly want. If you desire to be unhappy, you will probably be unhappy both in this life and the next. If you desire to be happy, you'll probably be happy. If you want to be evil, the law of God will decree unto you that you will receive evil rewards for evil deeds. If you live the telestial law on earth, you'll receive a telestial glory. If you live a Celestial law, you'll receive a Celestial glory. It seems to me that this "law of restoration" thing is about as just as it can possibly get. Each person gets what they truly desire. Of course, we must keep in mind that a person truly desiring righteousness won't go out and act consistently wicked.
Verse 8 relates beautifully with Alma 29:4,8
God is, in very deed, exactly and perfectly just.